I stumbled on these two “hidden” settings on my Baofeng radio yesterday which I added to the Short Guide:

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• Short press to reverse repeater output and input
• Long press to scan channels or frequencies

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• Short press to toggle between H/L power
• Long press to lock the controls

From the MENU settings:

• 7. TDR ON allows the radio to quickly scan between the A/B channels or frequencies.
• 8. BEEP OFF turns of the beep when pressing buttons.
• 14. VOICE OFF' turns off the voice when pressing buttons. * 21/22. MDF-A/B sets how the channels / frequencies are displayed. I have one set to NAME and the other to FREQ. * 39. ROGER OFF'' turns off the roger beep. Please turn this off!